Crossword Genius

A diversion causing Tony to lose his way (3)

Ross

I believe the answer is:

toy

I'm a little stuck... Click here to teach me more about this clue!

'a diversion' is the definition.
(I've seen this in another clue)

'tony to lose his way' is the wordplay.
I cannot quite see how this works, but
'to' is within the answer.
A single letter 'y' remains which might be clued in a way I don't understand.
This explanation may well be incorrect...

'causing' is the link.

Can you help me to learn more?

(Other definitions for toy that I've seen before include "A child's plaything" , "Child's amusement" , "Teddy or Dolly" , "Trifle or dally with" , "One of spelt out words" .)

I've seen this clue in the Evening Standard.
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